The AP Style Guide describes a URL,an acronym for Uniform Resource Locator, to be an Internet address. It consists of the protocol (http:), domain (URL.com), server ("server" in server.URL.com), folder ("folder" in http://server.URL.com/folder/) and file ("file" in http://server.URL.com/folder/file).
Writers should use the full URL. For example; http://www.URL.com/webpage.html.
Break up a URL that won't fit on one line into two lines or more. However; AP Style dictates that you not add any hyphens or other punctuation like you do when breaking up a long word.
A URL should occupy the very last line of the story. It should go below even the list of contributors to the story.